As chalk is calcium carbonate, would it be suitable to put a chunk of natural edible chalk in the enclosure of my baby Hermann tortoises (they are 2 years old) so that they can nibble on it and trim frequently their beaks?

It seems that a lot of the chalk in the market comes from Ukraine....and given the precedents with Chernobyl and nontransparent facts on pollution these days in that area etc, I certainly don't want to give my precious babies some chalk from Ukraine.

I'll make sure the chalk I choose to buy is sourced far away from there. Better to be safe than sorry. May be i am too paranoid but i am always picky on the source of what i buy,especially when it goes through the mouth everyday.

No, Sabina, you’re certainly not paranoid. Years back people started giving crushed oyster shells to tortoises, heaven knows why, but a lot of this stuff was found to be contaminated with mercury poisoning. I’ve never used it and can’t see why you would, but it shows how silly trends can be dangerous. Do let us know what your findings are. I’ve been looking at various ones today and saw one was supposedly sourced from Norfolk which I thought was a bit odd. I’m not a geologist though lol